fix(shop): use production API via same-origin nginx proxy

Hardcoded localhost:5000 broke shop.zea.lt; wire env fileReplacements
and proxy /api + /uploads to the API container.

docker/docker-compose.yml

@@ -79,6 +79,7 @@ services:
     depends_on:
       - api
     networks:
+      - iled
       - homelab
     labels:
       - "traefik.enable=true"
@@ -95,6 +96,7 @@ services:
     depends_on:
       - api
     networks:
+      - iled
       - homelab
     labels:
       - "traefik.enable=true"